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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "buffer.h"
#include "printf-format-fix.h"
#include "unichar.h"
#include "str.h"
#include <stdio.h>
string_t *str_new(pool_t pool, size_t initial_size)
{
/* never allocate a 0 byte size buffer. this is especially important
when str_c() is called on an empty string from a different stack
frame (see the comment in buffer.c about this). */
return buffer_create_dynamic(pool, I_MAX(initial_size, 1));
}
string_t *str_new_const(pool_t pool, const char *str, size_t len)
{
string_t *ret;
i_assert(str[len] == '\0');
ret = p_new(pool, buffer_t, 1);
buffer_create_from_const_data(ret, str, len + 1);
str_truncate(ret, len);
return ret;
}
string_t *t_str_new(size_t initial_size)
{
return str_new(pool_datastack_create(), initial_size);
}
string_t *t_str_new_const(const char *str, size_t len)
{
return str_new_const(pool_datastack_create(), str, len);
}
void str_free(string_t **str)
{
if (str == NULL || *str == NULL)
return;
buffer_free(str);
}
static void str_add_nul(string_t *str)
{
const unsigned char *data = str_data(str);
size_t len = str_len(str);
size_t alloc = buffer_get_size(str);
if (len == alloc || data[len] != '\0') {
buffer_write(str, len, "", 1);
/* remove the \0 - we don't want to keep it */
buffer_set_used_size(str, len);
}
}
char *str_free_without_data(string_t **str)
{
str_add_nul(*str);
return buffer_free_without_data(str);
}
const char *str_c(string_t *str)
{
str_add_nul(str);
return str->data;
}
char *str_c_modifiable(string_t *str)
{
str_add_nul(str);
return buffer_get_modifiable_data(str, NULL);
}
bool str_equals(const string_t *str1, const string_t *str2)
{
if (str1->used != str2->used)
return FALSE;
return memcmp(str1->data, str2->data, str1->used) == 0;
}
void str_append_max(string_t *str, const char *cstr, size_t max_len)
{
const char *p;
size_t len;
p = memchr(cstr, '\0', max_len);
if (p == NULL)
len = max_len;
else
len = p - (const char *)cstr;
buffer_append(str, cstr, len);
}
void str_printfa(string_t *str, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
str_vprintfa(str, fmt, args);
va_end(args);
}
void str_vprintfa(string_t *str, const char *fmt, va_list args)
{
#define SNPRINTF_INITIAL_EXTRA_SIZE 128
va_list args2;
char *tmp;
size_t init_size;
size_t pos = str->used;
int ret, ret2;
VA_COPY(args2, args);
/* the format string is modified only if %m exists in it. it happens
only in error conditions, so don't try to t_push() here since it'll
just slow down the normal code path. */
fmt = printf_format_fix_get_len(fmt, &init_size);
init_size += SNPRINTF_INITIAL_EXTRA_SIZE;
/* @UNSAFE */
if (pos+init_size > buffer_get_writable_size(str) &&
pos < buffer_get_writable_size(str)) {
/* avoid growing buffer larger if possible. this is also
required if buffer isn't dynamically growing. */
init_size = buffer_get_writable_size(str)-pos;
}
tmp = buffer_get_space_unsafe(str, pos, init_size);
ret = vsnprintf(tmp, init_size, fmt, args);
i_assert(ret >= 0);
if ((unsigned int)ret >= init_size) {
/* didn't fit with the first guess. now we know the size,
so try again. */
tmp = buffer_get_space_unsafe(str, pos, ret + 1);
ret2 = vsnprintf(tmp, ret + 1, fmt, args2);
i_assert(ret2 == ret);
}
va_end(args2);
/* drop the unused data, including terminating NUL */
buffer_set_used_size(str, pos + ret);
}
void str_truncate_utf8(string_t *str, size_t len)
{
size_t size = str_len(str);
if (size <= len)
return;
str_truncate(str, uni_utf8_data_truncate(str_data(str), size, len));
}
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